US3568920A - Screw centrifuge - Google Patents

Screw centrifuge Download PDF

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Publication number
US3568920A
US3568920A US786662A US3568920DA US3568920A US 3568920 A US3568920 A US 3568920A US 786662 A US786662 A US 786662A US 3568920D A US3568920D A US 3568920DA US 3568920 A US3568920 A US 3568920A
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US
United States
Prior art keywords
internal rotor
insert
centrifuge
rotor
secured
Prior art date
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Expired - Lifetime
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US786662A
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English (en)
Inventor
Torben Boss Nielsen
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TITAN SEPARATOR
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TITAN SEPARATOR
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering
    • B04B3/04—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2033—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl with feed accelerator inside the conveying screw

Definitions

  • SCREW CENTRIFUGE ABSTRACT A screw centrifuge comprising inner and outer centrifuge rotors rotating at differential rotational speeds with a screw secured to the outer surface of the inner rotor for conveying separated solid matter.
  • Means for supplying raw material to the separating chamber between the rotors comprises an axially extending supply duct communicating with radial bushings secured in the inner rotor via a dismountable insert having corresponding, radially orientated discharge apertures.
  • SCREW CENUGE This invention relates to a screw centrifuge having a separating chamber defined between two rotors rotating at different numbers of revolutions, a conveyor screw located in the separating chamber an secured to the internal rotor and a supply duct in the internal rotor for supplying raw material to the separating chamber between the two rotors through one or more apertures in the wall of said internal rotor.
  • centrifuges which are also called decanters, are employed, inter alia, for a rough or preliminary separation of sludge such a sewer sludge and refuse from destruction plants, into a partially dried phase and a partially cleansed liquid phase, which, if desired, can both be treated further in other kinds of apparatus.
  • a screw centrifuge comprising a hollow internal rotor and an external rotor surrounding said internal rotor and defining therewith a separating chamber, means for rotatably supporting said rotors and means for rotating each of said rotors at mutually different numbers of revolutions per minute, a conveyor screw secured to the outer side of, said internal rotor, means for supplying a raw material to be separated into said separating chamber, said supply means comprising a supply duct extending axially within said internal rotor and having spaced inlet and outlet ends, said outlet end being formed by an insert detachably secured within said internal rotor and having an axially facing inlet aperture and at least one radially facing discharge aperture, at least one bushing detachably secured in the wall of the internal rotor and having an inner end face located opposite a surface surrounding said discharge aperture of said insert, and means for separately discharging constituents of said raw material from said separating chamber after separation thereof.
  • the bushing may be provided with a collar which abuts against an internal contact surface of the internal rotor, which collar provides for a particularly simple assembly and securing of the bushing that can be inserted from the interior of the internal rotor and subsequently be pressed against the contact surface.
  • the insert may be secured to an end flange on a shaft part which is secured detachably to the internal rotor.
  • the insert may be cruciform or stellate and comprise a plurality of radial discharge ducts which, at their inner ends are connected to an inlet duct extending axially in the insert and each discharge duct may, moreover, be connected with the inlet duct via a duct extending obliquely within the insert.
  • the oblique ducts mentioned counteract the accumulation of sludge in the raw material in front of a transverse wall which, in the insert, delimits the radial discharge ducts, so that more quick discharge of the material to the separating chamber is obtained.
  • FIG. 1 shows a longitudinal section through a part of a screw centrifuge embodying the present invention
  • FIG. 2 is a longitudinal section on a larger scale through the insert shown in FIG. 1 in the centrifuges internal rotor, which section is taken along lines II-II in FIG. 3;
  • FIG. 3 is a section along lines III-III in FIG. 2;
  • FIG. 4 is a section along lines IV-lVin FIG. 2 also showing the four discharge bushings and an adjoining part of the internal rotor without helix winding or convolution.
  • the screw centrifuge illustrated in FIG. 1 comprises an outer or external rotor l which, in a manner not shown in detail, is journaled rotatably in the centrifuges frame and is coupled to a driving mechanism.
  • An :internal rotor 2 coaxial with rotor 1 is journaled rotatably in relation to the outer rotor 1 which, in FIG. 1 is illustrated by two diagrammatically shown bearings 3' and 4.
  • the driving mechanism is arranged to cause rotors l and 2 to rotate at slightly differing numbers of revolutions per minute, whereby a screw 5 fixed to the outside of the internal rotor 2 acts as conveyor of solid matter which, in the annular separating chamber 6 delimited between rotors 1 and 2, is separated from a raw material supplied.
  • the raw material is supplied through a pipe 7 which, at its one end is fixed in the internal rotor 2 coaxial with same and which opens into an insert 8 fixed in rotor 2, whereby the insert acts as distributor supplying four radially mounted insert bushings 9 that have discharge ducts 10 opening into the separating chamber 6.
  • the insert 8 as shown in greater detail 181 FIGS. 2-4, has an axially extending hub 12,- the machined inner side of which encloses the end of pipe 7, in the periphery of which there is provided an O-ring l3, vide FIG. I, for sealing the connection.
  • the insert 8 Internally of the hub 12, the insert 8 has a transverse wall 14 with a central aperture 15 in line with the bore in the hub 12. The aperture 15 and the bore of hub 12 cooperate to define an axial inlet duct in the insert. At a distance from the transverse wall 14 the insert ends in a closed, terminal wall 16.
  • the main part of insert 8 is cross-shaped with four arms 19, each of which contains a radial duct 17.
  • the radially outer terminal surface 20 of each arm is flat and lies, when the insert is mounted in the centrifuge, with a small clearance opposite the radially inner end face on a bushing 9, vide FIGS. 1 and 4.
  • Each bushing 9 is provided with a collar 21 abutting on an internal shoulder surrounding the bore in the rotor 2, wherein the bushing is secured, preferably with a firm fit.
  • the insert 8 is secured to a flange 23 by means of four bolts 22 which flange, in turn, is welded to a tubular shaft 24, vide FIG. 1.
  • the flange 23 has a recess for receiving and centering a machined projection 24 on the terminal wall 16 of the insert.
  • the shaft 24 serves partly for'the journaling of the internal rotor 2, in that the bearing 3 is mounted on the extreme end of the shaft.
  • the tubular shaft with the insert 8 secured thereto is fixed to the rotor 2 by means of eight bolts 26, the heads of which abut against a flange 27 welded to the shaft 24, and the bolts are screwed into tapped holes in the rotor 2.
  • the four bolts 22 lie in the corners between the four arms 19 of the insert end their heads abut against a ring 28, vide FIG. 1 which, in turn, abuts against machined surfaces 29 on the four arms of the insert, vide FIGS. 2 and 3.
  • bushings 9 For replacing the insert and/or one or more of the bushings 9, bolts 26 are first loosened, after which the shaft 24 together with the insert 8 can be removed axially from the internal rotor 2.
  • the four collar bushings 9 are free after that and can be removed through the interior of the rotor 2. After the dismantling of the tubular shaft and the insert, these can be separated from each other by loosening of the screws 22. The assembly of the parts is effected in reversed sequence.
  • the bushings 9 normally do not require to have extremely firm or close fit in rotor 2, since the centrifugal force occurring at the centrifuge s operation will assist in keeping them in place.
  • a screw centrifuge comprising a hollow internal rotor and an external rotor surrounding said internal rotor and defining therewith a separating chamber, means for rotatably supporting said rotors and means for rotating each of said rotors at mutually different numbers of revolutions per minute, a conveyor screw secured to the outer side of said internal rotor, means for supplying a raw material to be separated into said separating chamber, said supply means comprising a supply duct extending axially within said internal rotor and having spaced inlet and outlet ends, said outlet end being formed by an insert detachably secured within said internal rotor and having an axially facing inlet aperture and at least one radially facing discharge aperture, at least one bushing detachably secured in the wall of the internal rotor and having an inner end face located opposite a surface surrounding said discharge aperture of said insert, and means for separately discharging constituents of said raw material from said separating chamber after separation thereof.

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  • Centrifugal Separators (AREA)
US786662A 1968-01-10 1968-12-24 Screw centrifuge Expired - Lifetime US3568920A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK7468AA DK118068B (da) 1968-01-10 1968-01-10 Centrifuge.

Publications (1)

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US3568920A true US3568920A (en) 1971-03-09

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Application Number Title Priority Date Filing Date
US786662A Expired - Lifetime US3568920A (en) 1968-01-10 1968-12-24 Screw centrifuge

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US (1) US3568920A (da)
DE (1) DE1817573A1 (da)
DK (1) DK118068B (da)
SE (1) SE334128B (da)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4298160A (en) * 1977-05-24 1981-11-03 Thomas Broadbent & Sons Limited Solid bowl decanter centrifuges
US5261869A (en) * 1992-04-06 1993-11-16 Alfa Laval Separation, Inc. Decanter centrifuge having discontinuous flights in the beach area
US5658232A (en) * 1991-11-27 1997-08-19 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US5769776A (en) * 1991-12-31 1998-06-23 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
US5971907A (en) * 1998-05-19 1999-10-26 Bp Amoco Corporation Continuous centrifugal separator with tapered internal feed distributor
US20020132718A1 (en) * 2000-08-31 2002-09-19 Koch Richard James Centrifuge for separating fluid components
US6561965B1 (en) * 2000-10-20 2003-05-13 Alfa Laval Inc. Mist pump for a decanter centrifuge feed chamber
US20030096691A1 (en) * 2000-08-31 2003-05-22 Koch Richard James Centrifuge systems and methods
US6605029B1 (en) 2000-08-31 2003-08-12 Tuboscope I/P, Inc. Centrifuge with open conveyor and methods of use
US20030228966A1 (en) * 2000-08-31 2003-12-11 Koch Richard James Centrifuge systems and methods
US20040167005A1 (en) * 2003-01-08 2004-08-26 Hensley Gary L. Method of retrofitting a decanting centrifuge
US20050245381A1 (en) * 2004-04-30 2005-11-03 National-Oilwell, L.P. Centrifuge accelerator system
US20060025297A1 (en) * 2002-03-14 2006-02-02 Alfa Laval Copenhagen A/S Decanter centrifuge with wear reinforcement inlet
US7282019B2 (en) * 2005-04-25 2007-10-16 Edward Carl Lantz Centrifuge with shaping of feed chamber to reduce wear
US20090215604A1 (en) * 2005-06-04 2009-08-27 Hiller Gmbh Helical conveyor centrifuge
US20120157289A1 (en) * 2009-06-12 2012-06-21 Alfa Laval Corporate Ab Centrifugal separator
WO2012089824A1 (en) 2010-12-30 2012-07-05 Alfa Laval Corporate Ab A centrifugal separator having an inlet with wear resistance members, and a feed zone element with wear resistance members
US20140038806A1 (en) * 2010-11-12 2014-02-06 Alfa Laval Corporate Ab Centrifugal separator, wear resistance member and set of wear resistance members for a centrifugal separator
EP3106230A1 (en) 2015-06-19 2016-12-21 Andritz S.A.S. Decanter centrifuge

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3638652A1 (de) * 1986-11-12 1988-06-01 Flottweg Bird Mach Gmbh Vollmantel-schneckenzentrifuge

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187997A (en) * 1962-02-12 1965-06-08 Ametek Inc Horizontal type centrifugal separator
US3279687A (en) * 1963-05-24 1966-10-18 Bird Machine Co Centrifuge
US3428246A (en) * 1967-12-21 1969-02-18 Pennsalt Chemicals Corp Centrifuge apparatus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187997A (en) * 1962-02-12 1965-06-08 Ametek Inc Horizontal type centrifugal separator
US3279687A (en) * 1963-05-24 1966-10-18 Bird Machine Co Centrifuge
US3428246A (en) * 1967-12-21 1969-02-18 Pennsalt Chemicals Corp Centrifuge apparatus

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4298160A (en) * 1977-05-24 1981-11-03 Thomas Broadbent & Sons Limited Solid bowl decanter centrifuges
US5683343A (en) * 1991-11-27 1997-11-04 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US5658232A (en) * 1991-11-27 1997-08-19 Baker Hughes Inc. Feed accelerator system including feed slurry accelerating nozzle apparatus
US6077210A (en) * 1991-12-31 2000-06-20 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
US5769776A (en) * 1991-12-31 1998-06-23 Baker Hughes Incorporated Feed accelerator system including accelerating vane apparatus
US5261869A (en) * 1992-04-06 1993-11-16 Alfa Laval Separation, Inc. Decanter centrifuge having discontinuous flights in the beach area
US5971907A (en) * 1998-05-19 1999-10-26 Bp Amoco Corporation Continuous centrifugal separator with tapered internal feed distributor
US20020132718A1 (en) * 2000-08-31 2002-09-19 Koch Richard James Centrifuge for separating fluid components
US20030096691A1 (en) * 2000-08-31 2003-05-22 Koch Richard James Centrifuge systems and methods
US6605029B1 (en) 2000-08-31 2003-08-12 Tuboscope I/P, Inc. Centrifuge with open conveyor and methods of use
US20030228966A1 (en) * 2000-08-31 2003-12-11 Koch Richard James Centrifuge systems and methods
US6780147B2 (en) 2000-08-31 2004-08-24 Varco I/P, Inc. Centrifuge with open conveyor having an accelerating impeller and flow enhancer
US7018326B2 (en) 2000-08-31 2006-03-28 Varco I/P, Inc. Centrifuge with impellers and beach feed
US6790169B2 (en) 2000-08-31 2004-09-14 Varco I/P, Inc. Centrifuge with feed tube adapter
US6561965B1 (en) * 2000-10-20 2003-05-13 Alfa Laval Inc. Mist pump for a decanter centrifuge feed chamber
US20060025297A1 (en) * 2002-03-14 2006-02-02 Alfa Laval Copenhagen A/S Decanter centrifuge with wear reinforcement inlet
US7247133B2 (en) * 2002-03-14 2007-07-24 Alfa Laval Copenhagen A/S Decanter centrifuge with wear reinforcement inlet
US7001324B2 (en) * 2003-01-08 2006-02-21 Hutchison Hayes, L. P. Method of retrofitting a decanting centrifuge
US20040167005A1 (en) * 2003-01-08 2004-08-26 Hensley Gary L. Method of retrofitting a decanting centrifuge
US20050245381A1 (en) * 2004-04-30 2005-11-03 National-Oilwell, L.P. Centrifuge accelerator system
US7282019B2 (en) * 2005-04-25 2007-10-16 Edward Carl Lantz Centrifuge with shaping of feed chamber to reduce wear
US20090215604A1 (en) * 2005-06-04 2009-08-27 Hiller Gmbh Helical conveyor centrifuge
US7862493B2 (en) * 2005-06-04 2011-01-04 Guenter Haider Centrifuge for continuous separation of flowable substances of different densities having an air extraction member
US9266122B2 (en) * 2009-06-12 2016-02-23 Alfa Laval Corporate Ab Centrifugal separator having a feed accelerator
US20120157289A1 (en) * 2009-06-12 2012-06-21 Alfa Laval Corporate Ab Centrifugal separator
US9943862B2 (en) * 2010-11-12 2018-04-17 Alfa Laval Corporate Ab Centrifugal separator, wear resistance member and set of wear resistance members for a centrifugal separator
US20140038806A1 (en) * 2010-11-12 2014-02-06 Alfa Laval Corporate Ab Centrifugal separator, wear resistance member and set of wear resistance members for a centrifugal separator
WO2012089824A1 (en) 2010-12-30 2012-07-05 Alfa Laval Corporate Ab A centrifugal separator having an inlet with wear resistance members, and a feed zone element with wear resistance members
US9333515B2 (en) * 2010-12-30 2016-05-10 Alfa Laval Corporate Ab Centrifugal separator having an inlet with wear resistance members, and a feed zone element with wear resistance members
US20140005024A1 (en) * 2010-12-30 2014-01-02 Alfa Laval Corporate Ab Centrifugal separator having an inlet with wear resistance members, and a feed zone element with wear resistance members
EP3106230A1 (en) 2015-06-19 2016-12-21 Andritz S.A.S. Decanter centrifuge
US20160368002A1 (en) * 2015-06-19 2016-12-22 Andritz S.A.S. Decanter centrifuge
CN106256441A (zh) * 2015-06-19 2016-12-28 安德里茨有限公司 滗析离心机
US9931643B2 (en) * 2015-06-19 2018-04-03 Andritz S.A.S. Decanter centrifuge with wear-resistant accelerator inserts
CN106256441B (zh) * 2015-06-19 2020-01-10 安德里茨有限公司 滗析离心机

Also Published As

Publication number Publication date
DE1817573A1 (de) 1969-12-04
SE334128B (da) 1971-04-05
DK118068B (da) 1970-06-29

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